Abstract
Ultrasonic nondestructive evaluation (NDE) is widely used for detecting flaws in oil pipelines. The backscattering noise may attain peak values greater than the sought flaw pulse. For improving the signal-to-noise ratio (SNR) and extracting a flaw echo corrupted by noise, a resonance demodulation technique and a resonance filter are proposed. The impulse response of the resonance filter can be represented as a superposition of Gaussian echoes. The analysis results show that this approach is more effective in extracting the information of a small flaw during pipeline NDE. The amplitude envelope of the processed ultrasonic signal after envelope detection obtains a notable SNR enhancement.
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Liang, W., Que, PW. & Yang, G. Ultrasonic flaw detection during NDE of oil pipelines via a resonance filter. Russ J Nondestruct Test 42, 398–403 (2006). https://doi.org/10.1134/S1061830906060076
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DOI: https://doi.org/10.1134/S1061830906060076